热带假丝酵母二型性菌体细胞的形态和结构差异

Differences in Shape and Inner Structure in Dimorphism of Candida tropicalis

用光学显微镜和电子显微镜研究热带假丝酵母 (Candida tropicalis)的二型性。菌丝体 (M)和单细胞酵母 (Y)形态差异很大 ,M是长管状多细胞相连 ,Y则是球形的单个细胞。内部结构上也体现了与其形态的相适应性。 M菌丝顶端大的液泡为菌丝的延伸提供压力 ,但当顶端生长芽管时 ,大液泡会分裂成小液泡 ,部分小液泡进入芽管 ;菌丝顶端和侧面的泡囊 ,与其顶端生长和侧枝发生有关。单细胞酵母中 ,靠近母细胞和子细胞相连的部位 ,有些囊泡和颗粒物质 。

The dimorphism of Candida tropicalis was studied by means of both optical and electronic microscopes.There is much difference in shape between mycelium and yeast. Mycelium is some tubular cells lined together, while yeast is single celled. The inner structures of mycelium and yeast are coincided with their shapes respectively.A large vacuole in the apical hypha of mycelium provides pressure for hypha expansion, whereas, the large vacuole was divided into small ones when hypha elongates from mother cell ,and some small vacuoles go into the new hyphae. There were many vesicles in the apicula and both sides of hyphae, which are response to apical growth and branching of hyphae. In yeast, some vesicles and particulate matters are found in the juncture between mother cell and daughter cell. They were related to formation of new cell wall and division of mother cell and daughter cell.